1 Volatile Memory 1.1 REG REG (Register) is a storage unit inside the CPU, sitting right next to the arithmetic unit — the fastest and smallest level of the storage hierarchy. General-purpose registers (RAX/RBX/RDI on x86, and so on) take part directly in instruction execution, with access latency around 0.2–0.5 ns (roughly one clock cycle), lost on power loss, and typically only tens to hundreds of bytes.

1. Creating the Image File 1.1 When Loop Storage Fits Treat an ordinary file as a /dev/loopN block device: reads and writes go through the block device interface, while the backing file is still just a file on the host. Mounting ISO and disk images Local practice and stress testing

This article covers single-node validation and three-node production deployment with cephadm. For architecture, operations, and functional testing, see Ceph Architecture and Operations. 1. Disk Preparation An OSD can only use a block device (/dev/sdX, a partition, /dev/loopN). 1.1 Inspecting Available Devices 1 2 3 4 5 6 7 lsblk -o

Ceph is a unified distributed storage system that supports block storage (RBD), object storage (RGW), and file storage (CephFS). The official cephadm can orchestrate each daemon as a container (Docker, or Podman + Containerd); see Deploying Ceph in Containers for details. 1. Architecture 1.1 Topology and Data Paths The diagram below shows a common five-node topology (3 MON + 2 MGR + 5 OSD): MONs only need to come in odd numbers, and in a five-node deployment 3 is enough (tolerating one MON failure); 5 MONs tolerate 2 failures, but the metadata overhead is larger, so there is generally no need to run a MON on every machine.

1. Installation and Deployment Download the deployment file 1 wget https://raw.githubusercontent.com/juicedata/juicefs-csi-driver/master/deploy/k8s.yaml Check kubelet’s install directory on any non-master node 1 ps -ef|grep kubelet |grep root-dir If there is a value, you need to perform the replacement; otherwise install directly. 1 sed 's@/var/lib/kubelet@{{KUBELET_DIR}}@g' k8s.yaml 1 kubectl apply -f k8s.yaml Check the